Gregory Maguire (born June 9, 1954) is an American novelist. He is the author of Wicked: The Life and Times of the Wicked Witch of the West, Confessions of an Ugly Stepsister, and several dozen other novels for adults and children. Many of Maguire's adult novels are inspired by classic children's stories. Maguire published his first novel, The Lightning Time, in 1978. Wicked, published in 1995, was his first novel for adults. Though unsuccessful at first, it was adapted into a popular Broadway musical in 2003, which then became a two-part film adaptation released in 2024 and 2025 respectively.

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